Improvement in sewing-machines



W. MiLLER.

Sewing Machine No. 20,763. Patented )une 29, 1858,

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STATES UNITE Y.` MILLER, OF CAMBRIDGE, ASSIGNOR TO HIMSELF AND WILLIAM I?. PRESOOTT, OF NEV' YORK, N. Y.

IMPROVEMENT IN SEWINGMACI-HNES.

Specification forming part of Letters Patent N0. 20.?63, dated June 2f), 1858.

To all whom it may concern.-

Be it known that I, WESLEY MILLER, of Cambridge, in the county of Vashington and State of New York, have invented, made, and applied to use a certain new and useful Improvement in Sewing-Machines, and, I do hereby declare that the following is a full, clear, and exact description of the construetion and operation of the same, reference being had to the annexed drawings, making part of this speeication, wherein- Figure 1 is an inverted plan of the said sewing-machine, showing the works beneath the bed; and Fig. 2 is a side view of the same, the bed being shown partially in section.

Similar marks of reference indicate the same parts. p

The nature of my said invention relates to a peculiar device for givingmotion to th e loop er to take a loop of needle-thread.

In the drawings, a is the bed of the machine, which may be attached to the edge of a table by means of the bracket I) and the bindingscrew 1. j

c is the main or fly wheel, set on the center screw, 2, and having a handle, 8, by which it is rotated, and a slot, 4, of the desired cam shape. (See dotted lines, Fig. 2.) In this cam 4 a roller on the lower end of the needlearm d travels. This arm (Z is on the fulcrum 5, and carries the needle 6 in the usual manner, also the spool 7, from which the thread passes to the needle. On the center 5 is the arm e, the end of which becomes a pressurepad for the feed to act against, and said arm is kept toward the bed a by a spring, 7, on the under side of the bed.

f is a slide attached at one end to the lower end of the needle-arm at 8, and slides by a slot on a screw, 9, and against the block 10 on the bed a, so that this slide receives a reciprocating motion each vibration of the needle-arm and needle.

fi is a looper, attached to the stock g, that moves on the fulcrum-screw 11, and is provided with a hooked heel-piece, 12, and a straight edge, 13, and his an adjustable iinger, attached by a slot and screw to the slide f. The operation of this part is that as the needle rises the finger la, coming against the part 13, projects the looper t' through the loop `of needle-thread, and there the looper stands while the needle rises andk again descends, the finger l1, sliding against the straight part 13 of the stock g, and when the needle has taken the loop from the looper t' to form the chainstitch the finger h takes the heel 12 and throws the looper back, and the moment the needle begins to rise and the slide f to move forward the nger h, taking the part 13, throws the looper into the loop, and the operationsare repeated.

7c is a feeding-wheel on a bracket, Z, which wheel projects slightly from the table.

m is a fine-toothed .ratchet adjoining the wheel k.

n is a lever on a fulcrum, 14, having a pawl, o, and spring to the ratchet-teeth m. The long end of this lever is bent toward the slide f, and passes through a slotted plate, p, at`

tached to said slide. This plate p is connected by a screw, 15, at one end and by an vadjusting-screw, 16, at the other, so that the ngle of the slotted plate with the slide j can be increased or decreased for the purpose of varying the action of the same on the lever n and regulatingthe number of the ne ratchetteeth taken up each time by the pawl o, and by consequence the length of stitches in the material from the motion of the wheel k.

Having thus described the nature of my said invention, I do not claim a looper moving in the arc of a circle, as that hasbefore been used; neither do I claim moving such looper by a disconnected lever; butV Vhat I claim as my'invention, and desire to secure by Letters Patent, is-

The hooked heel-piece 12 and straight side 13 on the looper-stock g, in combination with the finger h, having a reciprocating motion on the slide f, whereby the :necessary motions for taking a loop, pausing during the ascent and commencement of the descent of kthe needle, drawing back out of the loop, and then taking a fresh loop of needle-thread, are given from the continuously-reciprocating finger 7L without the use of springs, as described and shown.

In testimony whereof I have hereunto set my signature this 5th day of May, 1858.

VESLEY MILLER. 

